> For the complete documentation index, see [llms.txt](https://www.oulan.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.oulan.com/2017/04/28.md). # 28 过去的四个月你学到了什么，有了什么变化呢？早安，世界。早安，前进的你。